Details of IODDT Implicit Exchange Objects of Type T_COM_CHAR_BMX
(Original Document)
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At a Glance
The tables below show the implicit exchange objects of the IODDT of the T_COM_CHAR_BMX type that are applicable to Character Mode communication.
Error bit
The following table shows the meaning of the error bit CH_ERROR (%Ir.m.c.ERR):
Standard symbol
Type
Access
Meaning
Address
CH_ERROR
EBOOL
R
Communication channel error bit.
%Ir.m.c.ERR
Signal object on input
The table below shows the meaning of the bit of the INPUT_SIGNALS word (%IWr.m.c.0):
Standard symbol
Type
Access
Meaning
Address
DCD
BOOL
R
Data Carrier Detect RS232 signal (applicable to BMX NOM 0200 module only).
%IWr.m.c.0.0
CTS
BOOL
R
Clear to send RS232 signal.
%IWr.m.c.0.2
DSR
BOOL
R
Data Set ready RS232 signal (applicable to BMX NOM 0200 module only).
%IWr.m.c.0.3
NOTE: %IWr.m.c.0.2 is at 1 when the voltage on the CTS signal is positive. It is also applicable to DCD and DSR.